Bone nail scissors structure

Abstract

The utility model relates to a bone nail scissors structure in the technical field of bone nail scissors, which comprises a shell, a base, a mounting seat and a cutting head, a driving device comprises a transmission gear set, a driving motor and a control circuit board, a screwing cam is of an inward concave structure, and the inward concave part of the screwing cam is provided with a raised part; the driving motor is adopted to drive the transmission gear set for driving, the effects of being high in torsion and increasing cutting force are achieved, limiting is controlled in cooperation with a program of the control circuit board, stroke overload is prevented, and circuit damage caused by overload is avoided; due to the mode that the installation position of the cutting head is limited by the inwards-concave structure and the protruding part, acting force is continuously applied to the cutting head when the cutting head does not reach a limiting point during cutting; the structure adopts a small and portable mode, is convenient to carry and flexible to operate, reduces the transportation cost and expenditure and reduces the operation bulkiness, adopts a simplified structure to be matched with electric drive to complete cutting, avoids the condition of fatigue caused by manpower expenditure, and improves the working efficiency.

Description

Technical Field

[0001] This utility model relates to the field of bone screw shearing technology, and in particular to a bone screw shearing structure. Background Technology

[0002] A bone screw cutter is a tool specifically designed for use in medical surgery, primarily for cutting or trimming bone screws, bolts, or other similar internal fixation devices. This device is commonly used in fracture repair, spinal surgery, and other orthopedic procedures to help stabilize bones and promote healing. It is driven by the bone screw cutter to trim when the length of these fixation devices needs to be adjusted, or when excess material needs to be removed at the end of surgery.

[0003] Most existing bone screw shears use manual pressing to generate cutting force. While this driving method and structure offer compactness and flexibility, prolonged pressing can easily cause operator fatigue, potentially leading to improper operation due to fatigue and increasing medical risks. Furthermore, when used in specific environments, such as those requiring continuous or stable force application, the uneven pressure from manual pressing necessitates further structural modifications, increasing procedures and reducing efficiency. Therefore, the inventors have proposed a bone screw shear structure to address the aforementioned technical problems. Utility Model Content

[0004] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the aforementioned problems.

[0005] A bone screw scissor structure includes a housing, a base, a mounting base, and a cutting head. The mounting base defines the installation position of the cutting head, and one end of the mounting base abuts against the surface of the housing. The base and housing are detachable, and the base abuts against the housing via mounting screws. A drive device for driving the cutting head to perform cutting operations is installed inside the housing. The drive device includes a transmission gear set, a drive motor, and a control circuit board. One end of the drive motor is a pin for electrical connection with the control circuit board, and one end of the pin abuts against the surface of the control circuit board. One end of the drive motor is an output end connected to the transmission gear set. One end of the transmission gear set is connected to a tightening cam for assisting the cutting head in cutting. One end of the tightening cam abuts against the cutting head and drives the cutting head to move. The tightening cam has a concave structure, and the concave portion of the tightening cam has a raised portion. The cutting head is a horizontal cutting structure.

[0006] This structure uses a drive motor to drive a transmission gear set, resulting in strong torque and increased cutting force. The control circuit board's program-controlled limit switches prevent overload and avoid circuit damage. The mounting base limits the installation position of the cutting head, ensuring that the blade continues to apply force until it reaches the limit point. The drive current of the control circuit board adjusts the required cutting force, speed, and time. This structure is also compact and lightweight, making it easy to carry and operate flexibly.

[0007] Furthermore, one end of the control circuit board is electrically connected to a data connector. The data connector extends to the surface of the housing and has a raised structure. The data connector is used to connect to an external power data line. When the data connector is connected to the power data line, the input power of the power data line is converted by the control circuit board. The data connector, in conjunction with the drive current of the control circuit board, adjusts the required cutting force, speed, and time.

[0008] Furthermore, the base is internally equipped with a slide rail, and the surface of the base is equipped with limit rods to prevent the slide rail from overtraveling. The limit rods are respectively installed at both ends of the base, and the limit rods and the base are detachable. The limit rods can effectively prevent the housing from moving beyond the safe travel range of the slide rail, avoiding mechanical damage or functional failure caused by excessive movement. By limiting the travel, the risk of accidents is reduced, and collisions between the housing and the base are avoided. During assembly, the detachable structure facilitates the disassembly and assembly of the limit rods, and the operator can adjust the installation position of the limit rods as needed, improving assembly efficiency.

[0009] Furthermore, the mounting base abuts against the housing via locking screws, which are arranged in a rectangular pattern. This rectangular arrangement of the locking screws ensures that the pressure is evenly distributed between the mounting base and the housing. This structure helps to avoid localized stress concentration, reduces the risk of deformation or damage caused by excessive force at a single point, and the rectangular arrangement of multiple locking screws provides a wider contact surface, enhancing the connection strength between the mounting base and the housing, ensuring a tight fit, preventing loosening, and improving stability.

[0010] Furthermore, a buffer spring is installed at one end of the base. The buffer spring is located inside the housing and is used to buffer the reaction force between the housing and the transmission gear set. The buffer spring can effectively absorb and disperse the impact and vibration from the transmission gear set, reduce the impact of these forces on the housing and its internal drive motor and control circuit board, thereby protecting sensitive components from damage. By reducing the pressure of the reaction force on the transmission gear set, the buffering force of the buffer spring helps to reduce wear, reduce the instantaneous impact generated during smooth transmission, make the transmission more stable, and reduce the risk of operational instability or failure caused by sudden changes in force.

[0011] Furthermore, the cutting head is connected to the mounting base via a fixing screw; the fixing screw provides a stable mechanical connection, ensuring a firm connection between the cutting head and the mounting base. This connection method can withstand greater forces and torques. At the same time, the fixing screw acts as a center point. When the tightening cam drives the cutting head to rotate, the cutting head performs a circular motion around the fixing screw as the center point.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. The drive motor drives the transmission gear set to achieve strong torque and increase the cutting force. The control circuit board controls the limit to prevent overload and avoid circuit damage caused by overload.

[0014] 2. By using the mounting base to limit the installation position of the cutting head, the cutting head will continue to apply force before reaching the limit point. The required cutting force, speed and time can be adjusted in conjunction with the drive current of the control circuit board.

[0015] 3. This structure is compact and lightweight, making it easy to carry and operate flexibly, reducing transportation costs and the bulkiness of operation. The simplified structure, combined with electric drive, completes the cutting, avoiding the fatigue caused by manual labor and increasing work efficiency.

[0016] 4. This structure adopts a horizontal cutting structure, which forms sufficient support between the shell 1, base 2, mounting base 3 and cutting head 4 to offset the reaction force generated by cutting. This avoids excessive force that could cause shaking at the moment of cutting the object. The horizontal structure not only increases the contact area between the structure and the support surface, thereby improving placement stability, but also increases its own weight to offset the reaction force generated by cutting, reducing the occurrence of medical accidents caused by operational errors due to shaking. Attached Figure Description

[0017] Figure 1 This is a three-dimensional diagram of a bone screw shear structure;

[0018] Figure 2 This is another three-dimensional view of a bone screw shear structure;

[0019] Figure 3 This is another three-dimensional diagram of a bone screw shear structure;

[0020] Figure 4 This is a front view of a bone screw shear structure;

[0021] Figure 5 yes Figure 4 Sectional view of AA;

[0022] Figure 6 This is a solid modeling sectional view of a bone screw shear structure;

[0023] Figure 7 This is an internal structural diagram of a bone screw shear structure;

[0024] Figure 8 This is another internal structural diagram of a bone screw shear structure;

[0025] Figure 9 This is another internal structural diagram of a bone screw shear structure;

[0026] Figure 10 This is a three-dimensional internal structure diagram of a bone screw shear structure;

[0027] In the diagram: housing-1, base-2, mounting base-3, cutting head-4, mounting screw-5, transmission gear set-6, drive motor-7, control circuit board-8, pin-9, tightening cam-10, data connector-11, slide rail-12, locking screw-13, buffer spring-14, fixing screw-15, limit rod-16. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0029] For this embodiment, please refer to Figures 1-10 The specific implementation of this bone screw scissor structure includes a housing 1, a base 2, a mounting base 3, and a cutting head 4. The mounting base 3 is used to define the installation position of the cutting head 4, and one end of the mounting base 3 abuts against the surface of the housing 1. The base 2 and the housing 1 are detachable, and the base 2 abuts against the housing 1 by mounting screws 5. A drive device for driving the cutting head 4 to perform cutting operations is installed inside the housing 1. The drive device includes a transmission gear set 6, a drive motor 7, and a control circuit board 8. One end of the drive motor 7 is used to connect with... The control circuit board 8 is electrically connected to pin 9. One end of pin 9 abuts against the surface of the control circuit board 8. One end of the drive motor 7 is the output end, which is connected to the transmission gear set 6. One end of the transmission gear set 6 is connected to a torque cam 10 for assisting the cutting head 4 in cutting. One end of the torque cam 10 abuts against the cutting head 4. The torque cam 10 is used to drive the cutting head 4 to move. The torque cam 10 has a concave structure. The concave part of the torque cam 10 has a raised part. The cutting head 4 has a horizontal cutting structure.

[0030] This structure uses a drive motor 7 to drive a transmission gear set 6, which provides strong torque and increases cutting force. The control circuit board 8 controls the limit switches to prevent overload and avoid circuit damage. The mounting base 3 limits the installation position of the cutting head 4, so that the cutting head continues to apply force before reaching the limit point. The drive current of the control circuit board 8 adjusts the required cutting force, speed and time. This structure is compact and lightweight, making it easy to carry and operate flexibly.

[0031] One end of the control circuit board 8 is electrically connected to a data connector 11. The data connector 11 extends to the surface of the housing 1 and has a raised structure. The data connector 11 is used to connect to an external power data line. When the data connector 11 is connected to the power data line, the control circuit board 8 converts the input power of the power data line. The data connector 11, in conjunction with the drive current of the control circuit board 8, adjusts the required cutting force, speed and time.

[0032] The base 2 has a slide rail 12 installed inside, and a limit rod 16 is installed on the surface of the base 2 to prevent the slide rail 12 from overtraveling. The limit rod 16 is installed at both ends of the base 2, and the limit rod 16 and the base 2 are detachable. The limit rod 13 can effectively prevent the housing 1 from moving beyond the safe travel range of the slide rail 12, avoiding mechanical damage or functional failure caused by excessive movement. By limiting the travel, the risk of accidents is reduced, and collisions between the housing 1 and the base 2 are avoided. During assembly, the detachable structure facilitates the disassembly and assembly of the limit rod 13. Operators can adjust the installation position of the limit rod 13 as needed, improving assembly efficiency.

[0033] The mounting base 3 abuts against the housing 1 via locking screws 13, which are arranged in a rectangular pattern. The rectangular arrangement of the locking screws 13 ensures that the pressure is evenly distributed between the mounting base 3 and the housing 1. This structure helps to avoid local stress concentration and reduces the risk of deformation or damage caused by excessive force at a single point. Furthermore, the rectangular arrangement of multiple locking screws 13 provides a wider contact surface, enhances the connection strength between the mounting base 3 and the housing 1, ensures a tight fit between the two, prevents loosening, and improves fixation.

[0034] A buffer spring 14 is installed at one end of the base 2. The buffer spring 14 is located inside the housing 1 and is used to buffer the reaction force between the housing 1 and the transmission gear set 6. The buffer spring 14 can effectively absorb and disperse the impact and vibration from the transmission gear set 6, reduce the impact of these forces on the housing 1 and its internal drive motor 7 and control circuit board 8, thereby protecting sensitive components from damage. By reducing the pressure of the reaction force on the transmission gear set 6, the buffering force provided by the buffer spring 14 helps to reduce wear, reduce the instantaneous impact generated during smooth transmission, make the transmission more stable, and reduce the risk of operational instability or failure caused by sudden changes in force.

[0035] The cutting head 4 is connected to the mounting base 3 by a fixing screw 15. The fixing screw 15 provides a stable mechanical connection, ensuring a firm connection between the cutting head 4 and the mounting base 3. This connection method can withstand large forces and torques. At the same time, the fixing screw 15 acts as a center point. When the tightening cam 10 drives the cutting head 4 to rotate, the cutting head 4 performs a circular motion with the fixing screw 15 as the center point.

[0036] The key design features of this invention are: a drive motor 7 drives a transmission gear set 6 to achieve strong torque and increase cutting force; the control circuit board 8 controls the limit position to prevent overload and avoid circuit damage caused by overload; the mounting base 3 limits the installation position of the cutting head 4 so that the cutting head continues to apply force before reaching the limit point; the drive current of the control circuit board 8 adjusts the required cutting force, speed and time; and the structure is compact and lightweight, making it easy to carry and operate flexibly.

[0037] On the other hand, this structure adopts a horizontal cutting structure, which forms sufficient support between the shell 1, base 2, mounting base 3 and cutting head 4 to offset the reaction force generated by cutting, avoiding excessive force that could cause shaking at the moment of cutting the object. The horizontal structure not only increases the contact area between the structure and the support surface, thereby improving the stability of placement, but also increases its own weight to offset the reaction force generated by cutting, reducing the occurrence of medical accidents caused by operational errors due to shaking.

[0038] The operation process of this utility model is as follows: an external power data line is connected through the data connector 11. When the data connector 11 is connected to the power data line, the input power of the power data line is converted by the control circuit board 8. The data connector 11, in conjunction with the drive current of the control circuit board 8, adjusts the required cutting force, speed and time. The current input causes the drive motor 7 to drive the transmission gear set 6 to operate. The transmission gear set 6 transmits power in sequence, thereby reaching the tightening cam 10. Both sides of the cutting head 4 are movable. When the tightening cam 10 drives the movable side of the cutting head 4 to move, due to the groove in the tightening cam 10, the concave structure causes the cutting head 4 to move in a circle with the fixing screw 15 as the center point. The raised part causes the cutting head on the movable side of the cutting head 4 to continue to apply cutting force before reaching the limit point, reducing the probability of insufficient cutting force and failure to perform the cutting process.

[0039] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A bone screw scissor structure, comprising a housing, a base, a mounting base, and a cutting head, characterized in that: The mounting base is used to define the installation position of the cutting head. One end of the mounting base abuts against the surface of the housing. The base and the housing are detachable. The base abuts against the housing by mounting screws. The housing is equipped with a drive device for driving the cutting head to perform cutting operations. The drive device includes a transmission gear set, a drive motor, and a control circuit board. One end of the drive motor is a pin for electrical connection with the control circuit board. One end of the pin abuts against the surface of the control circuit board. One end of the drive motor is an output end, which is connected to the transmission gear set. One end of the transmission gear set is connected to a tightening cam for assisting the cutting head in cutting. One end of the tightening cam abuts against the cutting head. The tightening cam is used to drive the cutting head to move. The tightening cam has a concave structure. The concave part of the tightening cam has a raised part. The cutting head is a horizontal cutting structure.

2. The bone screw shear structure according to claim 1, characterized in that: One end of the control circuit board is electrically connected to a data connector, which extends to the surface of the housing and has a raised structure. The data connector is used to connect an external power data line.

3. The bone screw shear structure according to claim 1, characterized in that: The base has a slide rail installed inside, and a limit rod is installed on the surface of the base to prevent the slide rail from overtraveling. The limit rods are installed at both ends of the base, and the limit rods are detachable from the base.

4. A bone screw shear structure according to any one of claims 1-3, characterized in that: The mounting base is abutted against the housing by locking screws, which are arranged in a rectangular pattern.

5. A bone screw shear structure according to any one of claims 1-3, characterized in that: A buffer spring is installed at one end of the base. The buffer spring is located inside the housing and is used to buffer the reaction force between the housing and the transmission gear set.

6. A bone screw shear structure according to any one of claims 1-3, characterized in that: The cutting head is connected to the mounting base by fixing screws.

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